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With Tesla making 21700 cells by the millions, it is only a matter of time before they replace the 18650. If you don’t have Tesla cells, you can buy 21700 cells from Queen Battery. This Bloc holds six 21700 cells in parallel. Connect Blocs in series to multiply the voltage.
The Swing 5300 battery has decent energy density along with a longer cycle life and it is inexpensive. This BatteryBloc holds 8 batteries for 154 watt hours. The size is a 193865. You can often find these cells on ebay or I can order them for you.